Robert A. Russell

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Barnwood, GB

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Patents Grantslast 30 patents

Information Patent Grant
Modulated bias units for steerable rotary drilling systems
- Patent number 5,553,678
- Issue date Sep 10, 1996
- Camco International Inc.
- John D. Barr
- E21 - EARTH DRILLING MINING
Information Patent Grant
Modulated bias unit for rotary drilling
- Patent number 5,520,255
- Issue date May 28, 1996
- Camco Drilling Group Limited
- John D. Barr
- E21 - EARTH DRILLING MINING